I was walking through hallways of Customs Office and walked past a ladder. The ladder was aluminum and approximately 1.8m in height. A maintenance worker was at very top of the ladder working in the false celing on the HVAC unit. his body from waist up was inside the false celing, preventing him from seeing the ladder below. He was extending himself further into the celing by standing on his toes atop the ladder.  There were no cones surrounding the ladder, no warning signs, and no 2nd person assisting the worker in his task. This behavior was obesrved by my colleagues Abeer Aloraini and Shatha Alsheifani, who were also walking by in the hallway.  I waited by the ladder until the worker came down several steps. I did not call to him because I did not want to startle him. Part of the reason for my staying nearby was to make sure he was able to come back down safely. He only spoke Arabic, but I had my colleagues translate for me.   I informed the worker that he should not be working at height without assistance from one of his co-workers and that his ladder was too short for the task he was performing. He acknoeldged that he understood.
Hazard category: Falls from height